The Crossfire Series is a popular collection of romance novels written by author Sylvia Day. The series follows the intense and passionate relationship between the main characters, Eva Tramell and Gideon Cross, as they navigate their complicated pasts and emotional struggles. Set in New York City, the story explores themes of love, desire, and personal growth. The series consists of five main books, starting with "Bared to You," published in 2012. Each installment delves deeper into the characters' lives, revealing their vulnerabilities and the challenges they face together. The Crossfire Series has garnered a large fanbase and has been praised for its engaging storytelling and character development.